Task 30984.

An electron enters a uniform magnetic field at an angle of 30 ° to the lines of magnetic induction and flying field area 15 cm long 30 ns, making 10 turnovers. Find: force to act on the electron by the magnetic field, and the potential difference of the electric field, which it has been accelerated before entering the magnetic field.
Detailed solution shorthand terms, formulas and laws used in the decision, the withdrawal of the calculation formula and the response.
If you have any questions to address, please. I'll try to help.